}
}
3. 创建View并添加到
private lateinit var floatingView: View
override fun onStartCommand(intent: Intentflags: Int, startId: Int): Int {
if (Settings.canDrawOverlays(this)) {
floatingView = LayoutInflater.from(this).inflate(R.layout.layout_floating_window.xml, null)
windowManager.addView(floatingView, layoutParams)
}
return super.onStartCommand(intent, flags, startId)
}
4. 实现悬浮窗的拖拽和关闭功能
// 浮窗的坐标
private var x = 0
private var y = 0
override fun onStartCommand(intent: Intentflags: Int, sta
rtId: Int): Int {
if (Settings.canDrawOverlays(this)) {
floatingView = LayoutInflater.from(this).inflate(R.layout.layout_floating_window.xml, null)
windowManager.addView(floatingView, layoutParams)
// 点击浮窗的右上角关闭按钮可以关闭浮窗
floatingView.findViewById(R.id.iv_close).setOnClickListener {
windowManager.removeView(floatingView)
}
// 实现浮窗的拖动功能, 通过改变layoutParams来实现
floatingView.findViewById(R.id.layout_drag).setOnTouchListener { v, event ->
when (event.action) {
MotionEvent.ACTION_DOWN -> {
x = event.rawX.toInt()
y = event.rawY.toInt()
}
MotionEvent.ACTION_MOVE -> {
val currentX = event.rawX.toInt()
val currentY = event.rawY.toInt()
val offsetX = currentX – x
val offsetY = currentY – y
x = currentX
y = currentY
layoutParams.x = layoutParams.x + offsetX
layoutParams.y = layoutParams.y + offsetY
// 更新floatingView
windowManager.updateViewLayout(floatingView, layoutParams)
}
}
true
}
return super.onStartCommand(intent, flags, startId)
}
5. 利用广播进行通信
private var receiver: MyReceiver= null
override fun onCreate() {
// 注册广播
receiver = MyReceiver()
val filter = IntentFilter()
filter.addAction(“android.intent.action.MyReceiver”)
registerReceiver(receiver, filter)
}
inner class MyReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
val content = intent.getStringExtra(“content”) “”
// 通过Handler更新UI
val message = Message.obtain()
message.what = 0
message.obj = content
handler.sendMessage(message)
}
}
val handler = Handler(this.mainLooper) { msg ->
tvContent.text = msg.obj as String
false
}
可以在Activity中通过广播给Service发送信息
fun sendMessage(view: View{
Intent(“android.intent.action.MyReceiver”).apply {
putExtra(“content”, “Hello, World!”)
sendBroadcast(this)
}
}
6. 设置权限
悬浮窗的显示需要权限，在中添加：
此外，还要通过来让动态设置权限，在Activity中设置。
// MainActivity.kt
fun startWindow(view: View{
if (!Settings.canDrawOverlays(this)) {
startActivityForResult(Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse(“package:$packageName”)), 0)
} else {
startService(Intent(this@MainActivity, FloatingWindowService::class.java))
}
}
/p>
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent{
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == 0) {
if (Settings.canDrawOverlays(this)) {
Toast.makeText(this, “悬浮窗权限授权成功”, Toast.LENGTH_SHORT).show()
startService(Intent(this@MainActivity, FloatingWindowService::class.java))
}
}
}
3.3 完整代码
class FloatingWindowService : Service() {
private lateinit var windowManager: WindowManager
private lateinit var layoutParams: WindowManager.LayoutParams
private lateinit var tvContent: AppCompatTextView
private lateinit var handler: Handler
private var receiver: MyReceiver= null
private var floatingView: View= null
private val stringBuilder = StringBuilder()
private var x = 0
private var y = 0
// 用来判断floatingView是否attached 到 window manager，防止二次removeView导致崩溃
private var attached = false
override fun onCreate() {
super.onCreate()
// 注册广播
receiver = MyReceiver()
val filter = IntentFilter()
filter.addAction(“android.intent.action.MyReceiver”)
registerReceiver(receiver, filter);
// 获取windowManager并设置layoutParams
windowManager = getSystemService(WINDOW_SERVICE) as WindowManager
layoutParams = WindowManager.LayoutParams().apply {
type = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
} else {
WindowManager.LayoutParams.TYPE_PHONE
}
format = PixelFormat.RGBA_8888
// format = PixelFormat.TRANSPARENT
gravity = Gravity.START or Gravity.TOP
flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL or WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
width = 600
height = 600
x = 300
y = 300
}
handler = Handler(this.mainLooper) { msg ->
tvContent.text = msg.obj as String
// 当文本超出屏幕自动滚动，保证文本处于最底部
val offset = tvContent.lineCount * tvContent.lineHeight
floatingViewapply {
if (offset > height) {
tvContent.scrollTo(0, offset – height)
}
}
false
}
}
override fun onBind(intent: Intent: IBinder{
return null
}
@SuppressLint(“ClickableViewAccessibility”)
override fun onStartCommand(intent: Intentflags: Int, startId: Int): Int {
if (Settings.canDrawOverlays(this)) {
floatingView = LayoutInflater.from(this).inflate(R.layout.layout_show_log, null)
tvContent = floatingView!!.findViewById(R.id.tv_log)
floatingView!!.findViewById(R.id.iv_close).setOnClickListener {
stringBuilder.clear()
windowManager.removeView(floatingView)
attached = false
}
// 设置TextView滚动
tvContent.movementMethod = ScrollingMovementMethod.getInstance()
{
floatingView = LayoutInflater.from(this).inflate(R.layout.layout_show_log, null)
tvContent = floatingView!!.findViewById(R.id.tv_log)
floatingView!!.findViewById(R.id.iv_close).setOnClickListener {
stringBuilder.clear()
windowManager.removeView(floatingView)
attached = false
}
// 设置TextView滚动
tvContent.movementMethod = ScrollingMovementMethod.getInstance()
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